![]() Yellow wires are from transformer secondary. Let’s take a look around the Astron RS-35A. This noise can be suppressed, sometimes quite effectively, but nothing is quieter than a good linear supply. However, switching power supplies generate electrical noise which can interfere with radio operation. These days, switching power supplies are available which are much smaller, more lightweight, and often significantly more efficient. ![]() The basic design is very old, simple, well-proven, rugged and easy to service. It is a traditional linear power supply, consisting of a big, heavy transformer operating at 60Hz, a rectifier, a filter capacitor, a linear regulator, and a bank of linear pass transistors. This model has been in continuous production for decades. I recently purchased the venerable Astron RS-35A, one of the most popular amateur radio power supplies. It also allows a radio to operate easily off of 12V lead-acid batteries, or automotive electrical systems. Keeping the power supply in a separate unit from the radio makes the radio lighter and cheaper, and allows the heat from the power supply to stay far away from the radio. ![]() In home stations, this is usually supplied from the AC mains power via a “power supply”. Most ham radio transceivers do not run directly off of mains AC power, but instead operate from about 13.8VDC, using something in the range of ten to thirty amps or so. The Astron RS-35A, with the classic Altoids tin to show scale.
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